Why not do the smart thing and replace the flat hand springs BEFORE they break?
Smart depends on your perspective....however, it is unnecessary to do so.
Without the force of the spring, the hand will still engage the cylinder teeth IF the revolver is tipped forward. This is the motion I always use in shooting cowboy revolvers. Two reasons for me to do this....
(1) I'm still close to 6'2" tall, and I rarely encounter a target where I'm not aiming lower than arm height, thus it is natural to do so.
(2) I typically lower the muzzle as I cock my piece, could call this "gravity assist".
(3) Assuming one is considering the coil-spring, ball & setscrew....they are not period correct.
All bets are off when I'm shooting in zero gravity.....yep, I will keep in mind the necessity of the spring at that time.
The time you'll miss the hand spring is when loading, gravity ain't helping in this function....so have to keep a close eye on dropping powder & ball into each of the five holes you were planning on.
Yes, I've shot more than a few stages with a broke hand spring. No big deal.
BTW, the ability of the Colt revolver to continue functioning with one or more broken parts was considered by the Army Ordnance Board to be very advantageous.